Paper

Signal formation and sharing in AC-LGADs using the ALTIROC 0 front-end chip

Giacomini, G, Morenas, M, Seguin-Moreau, N, Rossi, E, De La Taille, C, C Munoz Camacho, D'Amen, G, Marchand, D, Serin, L, Tricoli, A, P -K Wang, Chen, W

2022

Overview

The development of detectors that provide high resolution in four dimensions has attracted wide-spread interest in the scientific community for applications in high-energy physics, nuclear physics, medical imaging, mass spectroscopy as well as quantum information. However, finding a technology capable of fulfilling such aspiration proved to be an arduous task. Among other silicon-based candidates, the Low-Gain Avalanche Diode (LGAD) has already shown excellent timing performances but proved to be unsuitable for fine pixelization. Therefore, the AC-coupled LGAD (AC-LGAD) approach was introduced to provide high resolution in both time and space, making it a promising candidate for future 4D detectors. However, appropriate readout electronics must be developed to match the sensor's fast-time and fine-pitch capabilities. This is currently a major technological challenge. In this paper, we test AC-LGAD prototypes read out by the fast-time ASIC ALTIROC 0, originally developed for the readout of DC-coupled LGADs for the ATLAS experiment at the HL-LHC. Signal generated by either betas from a \\(^{90}\\)Sr source or a focused infra-red laser were analyzed. This paper details the first successful readout of an AC-LGAD sensor using a readout chip. This result will pave the way for the design and construction of a new generation of AC-LGAD-based 4D detectors.

• Publisher: Cornell University Library, arXiv.org
• Subject: Avalanche diodes / Detectors / High resolution / Medical imaging / Nuclear physics / Quantum phenomena / Sensors